The primary call sign used by the unit was "Zorro", for interdiction missions over the Ho Chi Minh Trail, and the squadron was thus nicknamed the "Zorros." (The 606th Air Commando Squadron also used the "Zorro" call sign for a period of time prior to the establishment of the 22d for its missions over the Trail flying T-28 Trojan fighter bombers). The 22nd Special Operations Squadron's tail letters were "TS".